Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1975-05-09
1977-03-29
Spear, Jr., Frank A.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 60, 210 75, 210 77, 162 1, 162 27, C02B 120
Patent
active
040147886
ABSTRACT:
In the manufacture of wood pulp for use in making paper and other wood fiber products, it is first necessary to remove the bark from the logs. While this can be done using a dry process, a wet process offers many advantages. However, one big disadvantage of the wet process has been the inability to economically remove the bark fines from the water used in the wet process. The present invention provides an economical manner of solving this problem by using a rotary vacuum precoat filter equipped with a rotating knife to remove the bark fines from at least a portion of the recirculating water in a wet debarking process and to avoid long range problems with such a process by adding a small amount of finely divided talc to the bark fines suspension prior to filtration.
REFERENCES:
patent: 2652152 (1953-09-01), Frankenhoff
patent: 2845450 (1958-07-01), Anderson et al.
patent: 3080971 (1963-03-01), Hutto et al.
patent: 3520410 (1970-07-01), Hutto
patent: 3752314 (1973-08-01), Brown et al.
Ass et al., "Purification of Waste Water from Wood Treatment Plants," Chem. Abstracts, 158290b, 1974.
Roden et al., "Treatment and Reuse of Barker Effluents," Chem. Abstracts, 66018h, 1972.
2ND ED., The Pulping of Wood, 1969, pp. 96-99.
Bell George Richard
Lamar Richard Seyb
Hruskoci Peter A.
Johns-Manville Corporation
Kelly Joseph J.
Krone Robert M.
McClain James W.
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